Rebar Spiral Bending Machine – 6 to 25mm, 250 to 2000mm Coil

The Jamshedji rebar spiral bending machine rolls TMT bar from 6 mm to 25 mm into continuous circles, arcs and helical spirals, with coil diameters from 250 mm up to 2,000 mm. It produces the helical confinement reinforcement used in bored piles, circular columns, metro and flyover piers, and water-retaining structures — work an ordinary bar bender cannot do, because it needs a continuous rolled curve rather than a series of discrete bends. Driven by a 4 HP (3 kW) motor through an oil-bath gear reduction. Weight 350 kg.

Key specifications at a glance

• Bending capacity: 6–25 mm Fe500D TMT
• Minimum coil diameter: 250 mm
• Maximum coil diameter: 2,000 mm (larger with external support)
• Motor: 4 HP (3 kW) high-torque electric
• Transmission: oil-bath gear reduction
• Weight: 350 kg

Why spirals need a different machine

A bar bending machine makes a bend at a point. A spiral is not a series of bends — it is one continuous curve of constant radius, rolled progressively along the length of the bar. Try to make it on a standard bender and you get a polygon of flat segments rather than a circle, and the bar is worked hard at each bend point.

This machine uses three rolling pins that apply uniform pressure as the bar feeds through, so the curve forms gradually and the rebar matrix is not torn. Pitch — the spacing between spiral layers — is adjustable, so the helix can be set to match the pitch called for on the column or pile drawing rather than being approximated on site.

That matters structurally. Helical confinement is what holds a circular column together under load, and its performance depends on the spiral being the right diameter at the right pitch throughout.

Key features

• Triple roller setup gives uniform pressure and prevents bar deformation
• Adjustable pitch to match the spiral spacing on the design drawing
• Dual foot pedal controls for forward and reverse cycles, leaving both hands free
• Thick cast-iron main deck resists flexing under 25 mm bar loads
• Oil-bath gear reduction for smooth, sustained torque delivery
• Coil diameters from 250 mm through 2,000 mm on the machine alone
• 350 kg — substantial enough to stay planted, light enough to relocate in the yard

Where it is used

Bored and driven pile cages, circular and elliptical column reinforcement, metro viaduct and flyover piers, chimney and silo walls, water tanks and circular retaining structures, and precast cage fabrication.

Where it fits in the fabrication yard

Spiral work sits alongside the rest of the cage-making line rather than replacing any of it. Straight bar is cut on a GQ45 bar cutting machine and bent on a GW42 bar bending machine; rectangular links come off the CNC automatic stirrup bending machine or the manual ring making machine. Cages are tied with a rebar tying machine, and vertical bars in deep pile cages are joined with threaded couplers rather than lapped.

Full specifications

Buying, GST and delivery

• Supplied with a GST invoice (18% GST — CGST + SGST within Maharashtra, IGST interstate), ITC eligible
• Sold outright — Jamshedji Constro Equip does not rent or hire equipment
• Dispatched F.O.R. Pune to sites across India, plus export to Bangladesh, UAE, Kenya, Tanzania, Sri Lanka and Nepal
• Backed by a manufacturer founded in 1983, ISO 9001:2015 and MSME/Udyam registered, with 5,000+ clients
• After-sales support and spares available direct from the Bhosari works

Frequently asked questions